Public bug reported:
https://github.com/certbot/certbot/issues/5405#issuecomment-358524100
TLS-SNI-01 had a CA security issue in shared hosts, as such the
letsencrypt CA blocked the auth method. The update is in 0.21.0, until
it's pushed out renewing will be more difficult as you'll need to
configure webroot renewals.
This affects all current and future versions. I'm in 14.04.5 LTS
I'm on certbot 0.19.0, 20.0-3 is available in The Bionic Beaver
** Affects: python-certbot (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1745227
Title:
TLS SNI 01 authentication removed, must upgrade to 0.21.0 to renew
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